It appears you're trying to go somewhere that does not exist.  Given that this site is over 4 years old and has gone through many iterations (static, PHP, Movable Type, with Forum, Joomla, with Forum, again without Forum, now with decent URLs, etc.), I really don't blame you.

At this point, you can either use the menu to navigate around, or search the site.  When I wrote this, there was a search box in the top right corner of the site.  I have no idea if it is still there.  But find it and give it a whirl. 

Worst case, if you really need something, get in touch with me.